Have you noticed any changes or problems with your little one's development or facial appearance? Sometimes, a rare condition like Jacobsen Syndrome could be behind this. Don't worry, we'll keep everything simple.
What is Jacobsen Syndrome?
Simply put, Jacobsen Syndrome is a rare condition related to the chromosomes in our body. Our genes are located on these chromosomes. In this condition, several genes are missing or deleted from a part of our chromosome 11. To be precise, these genes are missing from the end of the long arm (q arm) of this chromosome. That is why it is also called 11q terminal deletion disorder.
Imagine, if a small piece of chromosome 11 is missing, the number of genes affected is also reduced. Then the symptoms may be reduced a little. But if a large part is missing, the symptoms are more severe. When some people have only a small part missing in this way, it is called partial Jacobsen syndrome or partial monosomy 11q. Monosomy is when part of a chromosome pair is missing.
Children with Jacobsen Syndrome have developmental delays , behavioral issues , and distinctive facial features . Many children also have congenital heart defects . They are also more likely to have a bleeding disorder called Paris-Trousseau syndrome.
There is currently no complete cure for this, and the survival time varies from person to person.
What are the symptoms of Jacobsen Syndrome?
The symptoms of Jacobsen Syndrome vary depending on the size and location of the deletion. Many people experience delays in the development of speech and motor skills . They may also have cognitive impairment and other learning disabilities .
Many children with Jacobsen Syndrome also have behavioral problems . For example, compulsive behavior and short attention span. Many children are also diagnosed with a condition called Attention-Deficit/Hyperactivity Disorder (ADHD) . This condition is also associated with an increased risk of developing Autism Spectrum Disorders .
Specific facial features
Children with Jacobsen Syndrome have several distinctive facial features. These include:
- Having a large head - macrocephaly
- A pointed forehead due to a skull abnormality (trigonocephaly)
- Small, low-set ears
- Eyes that are far apart - hypertelorism
- Drooping eyelids - ptosis
- The presence of a skin fold at the inner corner of the eye - epicanthal folds
- Wide nose bridge
- Downward-turning corners of the mouth
- A thin upper lip
- A small undercut
Other features
Several other features can be seen:
- Congenital heart defects
- Feeding difficulties
- Growth delay before and after birth
- Short stature
- Frequent sinus and ear infections
- Abnormalities of the digestive system, kidneys, and genitalia
Many people with Jacobsen Syndrome also have a bleeding disorder called Paris-Trousseau syndrome . This affects your child's platelets . Platelets are a type of cell that helps blood clot. With Paris-Trousseau syndrome, the child is at risk for abnormal bleeding throughout their life, and may bruise easily.
What are the causes of Jacobsen Syndrome?
Jacobsen Syndrome is a chromosomal disorder . As you know, chromosomes are the things that contain our genetic information (genes). These genes determine how our body should develop and function. Normally, there are 22 pairs of numbered chromosomes in the human body, plus one pair of sex chromosomes. Each chromosome has a short arm (p arm) and a long arm (q arm).
In some people, several genes at the end of the long (q) arm of chromosome 11 are deleted. The other half of chromosome 11 is normally intact. This is the cause of Jacobsen Syndrome. The larger the deletion size, the more severe the symptoms. Depending on the size of the deletion, the region can contain anywhere from 170 to more than 340 genes. The genes in this region are responsible for the proper development of our heart, brain, and facial features.
Is this dominant or recessive?
Dominant or recessive refers to how you get your genes from your parents.
However, in most cases, Jacobsen Syndrome is not hereditary. That is, it is not inherited from the parents. It is most often caused by a random error in cell division during embryonic development, resulting in the loss of a part of the chromosome. There is nothing the parents can do to prevent this from happening. People with Jacobsen Syndrome usually do not have a family history of the condition. However, they can pass the condition on to their children.
Very rarely, people with Jacobsen Syndrome can inherit the condition from an asymptomatic parent. This happens when a parent has a complex genetic event called a balanced translocation . Simply put, a part of chromosome 11 and a part of another chromosome swap places. This does not reduce the genetic material, so the parents do not show symptoms. However, when these chromosomes are passed on, the children may have an imbalance.
What are the risk factors?
Jacobsen Syndrome is a genetic condition that can affect anyone. Some research has found that it affects girls slightly more often.
How do doctors diagnose this?
Your doctor may be able to diagnose Jacobsen Syndrome during your pregnancy. If prenatal ultrasound scans raise any concerns, your doctor may recommend further testing. Common prenatal genetic screening tests include:
- Non-invasive prenatal testing (NIPT): This involves taking a small amount of your baby's DNA from a sample of your blood and checking for any abnormalities in the number of chromosomes.
- Chorionic villus sampling (CVS): The doctor uses a needle to take a sample of cells from the placenta.
- Amniocentesis: The doctor uses a needle to take a sample of the amniotic fluid in the uterus.
After the baby is born, the baby's doctor can diagnose Jacobsen Syndrome by doing genetic testing . In this genetic test, the doctor takes a sample of the baby's blood and looks at it under a microscope. They stain the chromosomes in the sample, which look like a barcode. This can look for broken chromosomes, missing genes. Usually, the broken part is on chromosome 11. However, more genetic tests are needed to find the exact location of the break.
Another test is Microarray Comparative Genomic Hybridization (Array CGH) . Sometimes very small changes in chromosomes, too small to be seen under a microscope, can cause Jacobsen Syndrome. That's when doctors do this Array CGH test. It shows very small changes in DNA throughout the baby's chromosomes. It can find out if the DNA is duplicated, disrupted, or missing.
How is Jacobsen Syndrome treated?
There is no cure for Jacobsen Syndrome. Treatment mainly focuses on:
- To manage your child's symptoms
- To help him reach his developmental milestones
- To avoid health complications
For babies who have difficulty eating, doctors may recommend a gastrostomy tube (G-tube) . This tube is placed directly into the baby's stomach to deliver food. A surgery called fundoplication can correct a problem with the valve at the bottom of the esophagus.
Your child may need other surgeries. For example, surgeries to correct craniofacial problems, such as trigonocephaly . Surgery may also be needed to correct vision or eye problems. Surgery may also be needed to correct skeletal, cardiac, and other defects.
Your child's doctor may prescribe certain medications for some heart complications. For example, antiarrhythmics . These are medications that help prevent or correct abnormal heart rhythms. They may also prescribe diuretics . These are medications that help remove excess water from the body.
Doctors may recommend corrective glasses, contact lenses, or surgery for eye abnormalities.
Doctors may give blood transfusions or platelet transfusions to treat the effects of Paris-Trousseau syndrome . They may also give you a medicine called desmopressin , which helps your blood clot.
Your child will definitely reach their developmental milestones at some point. However, early intervention can help them reach their full potential. Your child's doctor may recommend the following:
- Special remedial education
- Physical therapy
- Speech therapy
What can I expect if my child has Jacobsen Syndrome?
The life expectancy of people with Jacobsen Syndrome varies depending on the severity of their symptoms. Due to severe heart conditions and blood clotting problems, about 20% of babies with Jacobsen Syndrome die before the age of 2.
However, many children with Jacobsen Syndrome have survived into adulthood. Adults with this condition can live happy, fulfilling lives with varying degrees of independence.
Can Jacobsen Syndrome be prevented?
Because it is a genetic condition, Jacobsen Syndrome cannot be prevented. If you are pregnant or planning to become pregnant, ask your doctor about genetic counseling . A genetic counselor can help you understand your risk of having a child with Jacobsen Syndrome.
Finding out that your baby has Jacobsen Syndrome can be scary. Don't panic, but take the time to learn as much as you can about your child's diagnosis. If possible, try to find a doctor who understands your child's condition. He or she can give your child the best treatment options.
To help you cope with your child's diagnosis, look into support groups . Others who have been in the same situation as you can give you the knowledge and strength you need to help your child.
Take-Home Message
Jacobsen Syndrome is a rare and potentially complex condition, but remember, you are not alone.
- This is caused by a random genetic mutation , not the parents' fault.
- Early identification and intervention are very important to improve the child's quality of life.
- Seek help from specialist doctors, therapists, and counselors .
- The strength and experience gained from support groups with other parents is invaluable.
- Every child is different. Treat your child with love and patience according to their abilities and needs.
If you have any further questions about this, don't hesitate to talk to your doctor.
` Jacobsen Syndrome, chromosome abnormality, chromosome 11, genetic disease, developmental delay, Paris-Trousseau syndrome, congenital heart defect, genetic counseling
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